This is the blog maintained by staff at Microsoft to provide general information, announcements and provide answers to Frequently Asked Questions (FAQs) related to daylight saving time (DST) and time zone (TZ) changes around the world.
* Important Notice

Windows Hotfix Update now available for new Daylight Saving Time changes in Brazil

Brazil 2007-2008 Daylight Saving changes: The government of Brazil announced a change on September 20, 2007, in the observance of daylight saving time in the country. The new time change will take place in Brazil on October 14th (three weeks earlier than in 2006) when clocks should move one hour forward at midnight (between Saturday and Sunday). On February 17, 2008, Brazil will move clocks one hour at midnight (again, between Saturday and Sunday), one week earlier than in 2006.

Manual remediation has been provided for Windows as noted in KB article 914387, updated with the proper registry keys to account for the changes in Brazil; “Dynamic DST” keys are included allowing calendar rebasing with the Outlook Time Zone Data Update Tool (TZDUT).